CA2535165A1 - Engine decompression system - Google Patents

Engine decompression system Download PDF

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Publication number
CA2535165A1
CA2535165A1 CA002535165A CA2535165A CA2535165A1 CA 2535165 A1 CA2535165 A1 CA 2535165A1 CA 002535165 A CA002535165 A CA 002535165A CA 2535165 A CA2535165 A CA 2535165A CA 2535165 A1 CA2535165 A1 CA 2535165A1
Authority
CA
Canada
Prior art keywords
cam shaft
decompression
engine
decompression cam
weight
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002535165A
Other languages
French (fr)
Other versions
CA2535165C (en
Inventor
Shigeru Saito
Takashi Suzuki
Hiroshi Moriyama
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Honda Motor Co Ltd
Original Assignee
Honda Motor Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Honda Motor Co Ltd filed Critical Honda Motor Co Ltd
Publication of CA2535165A1 publication Critical patent/CA2535165A1/en
Application granted granted Critical
Publication of CA2535165C publication Critical patent/CA2535165C/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/02—Valve drive
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N19/00—Starting aids for combustion engines, not otherwise provided for
    • F02N19/004—Aiding engine start by using decompression means or variable valve actuation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/02—Valve drive
    • F01L1/024—Belt drive
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/08—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for decompression, e.g. during starting; for changing compression ratio
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/08—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for decompression, e.g. during starting; for changing compression ratio
    • F01L13/085—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for decompression, e.g. during starting; for changing compression ratio the valve-gear having an auxiliary cam protruding from the main cam profile
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2301/00—Using particular materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2820/00—Details on specific features characterising valve gear arrangements
    • F01L2820/03—Auxiliary actuators
    • F01L2820/035—Centrifugal forces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N3/00—Other muscle-operated starting apparatus
    • F02N3/02—Other muscle-operated starting apparatus having pull-cords

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Valve Device For Special Equipments (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)

Abstract

An engine decompression system that can secure a projecting height of a decompression cam from a base face of a valve operating cam to be relatively large in an engine starting rotational region, and maintain a state in which the projection height is decreased in a complete combustion rotational region of the engine.
The decompression system includes a decompression cam shaft provided on a valve operating cam shaft or a rotating member integrally coupled thereto, the decompression cam shaft being capable of rotating between an operating position in which a decompression cam projects above a base face of a valve operating cam to slightly open engine valves during a compression stroke and a release position in which the decompression cam is withdrawn to allow the engine valves to close.
A
centrifugal mechanism connected to the decompression cam shaft maintains the decompression cam shaft at an operating position in a starting rotational region, and rotates the decompression cam shaft to the release position in a normal running region. The centrifugal mechanism is arranged so that, in a complete combustion rotational region between the starting rotational region and the normal running region, the decompression cam shaft is maintained at a middle position at which the projection height of the decompression cam is less than the projection height at the operating position.

Claims (6)

1. An engine decompression system for an engine having a valve operating cam shaft and a valve operating cam for opening and closing an engine valve, said engine decompression system comprising:
a decompression cam shaft mounted on the operating cam shaft and a decompression cam mounted on the decompression cam shaft, wherein the decompression cam shaft rotates between an operating position in which a decompression cam projects above a base face of the valve operating cam for slightly opening the engine valve during an engine compression stroke, and a release position in which the decompression cam is withdrawn beneath the base face for allowing the engine valve to close; and a centrifugal mechanism connected to the decompression cam shaft to maintain the decompression cam shaft at the operating position during engine starting rotational region, and to rotate the decompression cam shaft to the release position in a normal running region, wherein in a complete combustion rotational region between the engine starting rotational region and the normal running region, the decompression cam shaft is maintained at a middle position in which the projection height of the decompression cam above the base face is less than the projection height at the operating position.
2. The engine decompression system according to Claim 1, wherein the centrifugal mechanism comprises: a first weight including an arm, the first weight being connected to the decompression cam shaft via the arm and maintaining the decompression cam shaft at the middle position by means of centrifugal force acting on the first weight in the complete combustion rotational region of the engine; a second weight axially supported on the valve operating cam shaft for rotating the decompression cam shaft from the middle position to the release position by means of centrifugal force acting on the second weight in the normal running region of the engine, the second weight having an extremity part connected to the first weight; and a return spring for urging at least one of the first weight or the second weight in a direction toward the operating position of the decompression cam shaft and maintaining the decompression cam at the operating position in the engine starting rotational region.
3. An engine decompression system for an engine having a valve operating cam shaft, a rotating member coupled to the valve operating cam shaft and a valve operating cam for opening and closing an engine valve, said engine decompression system comprising:
a decompression cam shaft mounted on the rotating member and a decompression cam mounted on the decompression cam shaft, wherein the decompression cam shaft rotates between an operating position in which a decompression cam projects above a base face of the valve operating cam for slightly opening the engine valve during an engine compression stroke, and a release position in which the decompression cam is withdrawn beneath the base face for allowing the engine valve to close; and a centrifugal mechanism connected to the decompression cam shaft to maintain the decompression cam shaft at the operating position during engine starting rotational region, and to rotate the decompression cam shaft to the release position in a normal running region, wherein in a complete combustion rotational region between the engine starting rotational region and the normal running region, the decompression cam shaft is maintained at a middle position in which the projection height of the decompression cam above the base face is less than the projection height at the operating position.
4. The engine decompression system according to Claim 3, wherein the centrifugal mechanism comprises: a first weight including an arm, the first weight being connected to the decompression cam shaft via the arm and maintaining the decompression cam shaft at the middle position by means of centrifugal force acting on the first weight in the complete combustion rotational region of the engine; a second weight axially supported on the rotating member for rotating the decompression cam shaft from the middle position to the release position by means of centrifugal force acting on the second weight in the normal running region of the engine, the second weight having an extremity part connected to the first weight; and a return spring for urging at least one of the first weight or the second weight in a direction toward the operating position of the decompression cam shaft and maintaining the decompression cam at the operating position in the engine starting rotational region.
5. The engine decompression system according to Claim 2, wherein the rotating member is a driven timing gear integrally connected to the valve operating cam shaft; the decompression cam shaft is rotatably supported on the driven timing gear; the first weight connected to the decompression cam shaft, is disposed on one side of the driven timing gear; the second weight is disposed on the other side thereof, wherein the extremity part of the second weight is connected to the first weight through a long hole provided in the driven timing gear.
6. The engine decompression system according to Claim 4, wherein the rotating member is a driven timing gear integrally connected to the valve operating cam shaft; the decompression cam shaft is rotatably supported on the driven timing gear; the first weight connected to the decompression cam shaft, is disposed on one side of the driven timing gear; the second weight is disposed on the other side thereof, wherein the extremity part of the second weight is connected to the first weight through a long hole provided in the driven timing gear.
CA002535165A 2005-02-21 2006-02-02 Engine decompression system Expired - Fee Related CA2535165C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2005-44078 2005-02-21
JP2005044078A JP4490846B2 (en) 2005-02-21 2005-02-21 Engine decompression device

Publications (2)

Publication Number Publication Date
CA2535165A1 true CA2535165A1 (en) 2006-08-21
CA2535165C CA2535165C (en) 2010-01-12

Family

ID=36218569

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002535165A Expired - Fee Related CA2535165C (en) 2005-02-21 2006-02-02 Engine decompression system

Country Status (13)

Country Link
US (1) US7263960B2 (en)
EP (1) EP1703123B1 (en)
JP (1) JP4490846B2 (en)
KR (1) KR100815311B1 (en)
CN (2) CN100507223C (en)
AU (1) AU2006200386B2 (en)
BR (1) BRPI0600421A (en)
CA (1) CA2535165C (en)
DE (1) DE602006010463D1 (en)
ES (1) ES2335119T3 (en)
MX (1) MXPA06001971A (en)
TW (1) TWI279484B (en)
ZA (1) ZA200601478B (en)

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* Cited by examiner, † Cited by third party
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JP4490846B2 (en) 2005-02-21 2010-06-30 本田技研工業株式会社 Engine decompression device
DE102007047759A1 (en) * 2007-09-28 2009-04-09 Alfred Kärcher Gmbh & Co. Kg internal combustion engine
WO2009079459A1 (en) * 2007-12-19 2009-06-25 Graco Minnesota Inc. Effort reducing start mechanism for hydraulically propelled vehicles
JP5142804B2 (en) * 2008-04-25 2013-02-13 本田技研工業株式会社 Valve operating device for internal combustion engine
JP5312152B2 (en) * 2009-03-31 2013-10-09 本田技研工業株式会社 Variable valve gear for engine
KR101291490B1 (en) * 2009-09-14 2013-07-30 혼다 기켄 고교 가부시키가이샤 Valve gear of internal combustion engine
TWI451031B (en) * 2010-05-12 2014-09-01 Sanyang Industry Co Ltd Engine decompression mechanism
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CN105370338B (en) * 2014-08-22 2018-09-25 牛刚学 The executing agency of internal-combustion engine reliever
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TWI613364B (en) * 2015-04-17 2018-02-01 三陽工業股份有限公司 Method for controlling engine starting of a starter and generator device
CN106401689B (en) * 2015-07-27 2021-06-01 三阳工业股份有限公司 Engine with double pressure reducing devices
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CN112384683B (en) * 2018-07-05 2022-08-02 本田技研工业株式会社 Decompression device of engine and engine
TWM580123U (en) * 2018-11-30 2019-07-01 光陽工業股份有限公司 Decompression device of internal combustion engine
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CN113153480B (en) * 2021-06-08 2022-11-29 含山县大颉机械有限公司 Engine camshaft pressure reducing mechanism

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Also Published As

Publication number Publication date
MXPA06001971A (en) 2006-09-18
DE602006010463D1 (en) 2009-12-31
EP1703123B1 (en) 2009-11-18
JP2006226256A (en) 2006-08-31
EP1703123A1 (en) 2006-09-20
AU2006200386A1 (en) 2006-09-07
CN100507223C (en) 2009-07-01
BRPI0600421A (en) 2006-10-24
ZA200601478B (en) 2007-11-28
ES2335119T3 (en) 2010-03-22
AU2006200386B2 (en) 2009-07-16
TWI279484B (en) 2007-04-21
TW200632202A (en) 2006-09-16
JP4490846B2 (en) 2010-06-30
US7263960B2 (en) 2007-09-04
CN1824927A (en) 2006-08-30
CN2895747Y (en) 2007-05-02
CA2535165C (en) 2010-01-12
KR20060093289A (en) 2006-08-24
US20060185638A1 (en) 2006-08-24
KR100815311B1 (en) 2008-03-19

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Effective date: 20180202